the second check

基本解释

With this background, let's look at the function pthread_cond_timedwait, which you use for the second check.
有了这些背景知识，我们来看看 pthread_cond_timedwait 函数，这个函数用于进行第二个检查。
The second check is the opposite subset relationship, meaning that you must verify that every user in the CM group has a counterpart in the repository group.
第二项检查是检查相反的子集关系，即必须检验在 CM 组中的每个用户在库组中是否有对应的用户。
Next, the reader thread needs to ensure (and this is the second check you perform) that it does not wait on the condition variable any more than the specified timeout period.
接下来，读线程需要确保（这是第二个检查）它等待条件变量的时间不超过指定的超时时间。

So that's the second thing I've just highlighted here, is that I now have the ability to check whether it does the right thing.
你知道的，一个虚数,但是返回虚数就没有什么价值了,那么这是我想要强调的第二件事情。
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I actually need to check the second order condition.
实际上我们还需要验证二阶条件
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So how do I check the second order condition?
怎样验证二阶条件呢
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Once I managed to get through passport control and the second security check, I found an uncomfortable, crowded waiting area.
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